Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8afdeff2e21b49…

MALICIOUS

PDF

98.5 KB Created: 2021-07-14 02:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 06ab7ca77d83f7a3a6b7e0059d04f595 SHA-1: 09a6edfe6e7344022d82fdd390ddc88d2de1b60a SHA-256: 3e8afdeff2e21b4922ab75b70da480cdd66934f72cc0ce075167e03897293da3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of urgency lures further supports a phishing or scamming objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=bsbhrm501+assessment+answers PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/keg01tra2m413uivqsuj0ls0g5/78399060224.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/87076689735.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rusebunedetujepafuxu.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/saziwujubomololozaximimi.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/40347922811.pdfIn PDF document text
    • http://ruresept.ru/files/file/36200168229.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/sufek.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf4174b93---37217992885.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/59183711982.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/towujili.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/kodizitepefabi.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/javutixe.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/17d64fjvqg29d8gptbj508vdi1/nevepusabasavurus.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f22521f980---46943629620.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6093ddd43920bb11565184d242cf42f1/72710405087.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/dakunefog.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/wugonovoposikemevij.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b44bb6ef1---fatobalini.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/pixevovitepuvujitupuzog.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6e42340b63c188ccb2f3e7ab94ce5592/48024312366.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 10704 bytes
SHA-256: c1ea7ba2a8041314602b896e53ccb07560d0d9362d6698a6726f2d844658be94
font_01_sfnt_off000136a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB3 17288 bytes
SHA-256: 50e3af2e2a3b3f15ce09631505210e658815b5e011eec41500218ead658ba865

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